A high-resolution spectropolarimetric survey of herbig Ae/Be stars - II. rotation
Article
Article Title | A high-resolution spectropolarimetric survey of herbig Ae/Be stars - II. rotation |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Alecian, E. (Author), Wade, G. A. (Author), Catala, C. (Author), Grunhut, J. H. (Author), Landstreet, J. D. (Author), Bohm, T. (Author), Folsom, C. P. (Author) and Marsden, S. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 429 (2), pp. 1027-1038 |
Number of Pages | 12 |
Year | 2013 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sts384 |
Web Address (URL) | https://academic.oup.com/mnras/article/429/2/1027/1034036 |
Abstract | We report the analysis of the rotational properties of our sample of Herbig Ae/Be (HAeBe) and related stars for which we have obtained high-resolution spectropolarimetric observations. Using the projected rotational velocities measured at the surface of the stars, we have calculated the angular momentum of the sample and plotted it as a function of age. We have then compared the angular momentum and the v sin i distributions of themagnetic to the non-magnetic HAeBe stars. Finally, we have predicted v sin i of the non-magnetic, non-binary ('normal') stars in our sample when they reach the zero-age main sequence (ZAMS), and compared them to various catalogues of v sin i of main-sequence stars. First, we observe that magnetic HAeBe stars are much slower rotators than normal stars, indicating that they have been more efficiently braked than the normal stars. In fact, the magnetic stars have already lost most of their angular momentum, despite their young ages (lower than 1 Myr for some of them). Secondly, our analysis suggests that the low-mass (1.5 < M < 5M·) normal HAeBe stars evolve with constant angular momentum towards the ZAMS, while the high-mass normal HAeBe stars (M > 5M·) are losing angular momentum. We propose that winds, which are expected to be stronger in massive stars, are at the origin of this phenomenon. |
Keywords | early-type stars; magnetic field; pre-main-sequence; rotation |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
519999. Other physical sciences not elsewhere classified | |
510203. Nonlinear optics and spectroscopy | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Laboratory of Space Science and Astrophysical Instrumentation, France |
Queen's University, Canada | |
University of Western Ontario, Canada | |
University of Toulouse, France | |
Armagh Observatory, United Kingdom | |
Centre for Astronomy, Solar Radiation and Climate | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q202v/a-high-resolution-spectropolarimetric-survey-of-herbig-ae-be-stars-ii-rotation
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